Bio 141 Notes (1/23/14) Flashcards
0
Q
Gives each atom identity
A
Protons
Atomic number
1
Q
Atoms
A
Can’t be divided any further
Composed of nucleus (center) - neutrons and protons (positive)
Electrons (outside) negative
2
Q
How many electrons fill the shells
A
1st - 2
2nd - 8
3rd - 8
3
Q
Atoms with filled shells are…
A
stable, inert, non-reactive
4
Q
inert gases (ex.)
A
Neon, Helium, Argon
their shells are full
5
Q
Ions
A
Formed when atoms borrow electrons
6
Q
Ionic Bonds
A
taken not shared
7
Q
Cation
A
positively charged ion
8
Q
Anion
A
negatively charged ion
9
Q
acids give…
A
H+
10
Q
Bases give..
A
OH-
11
Q
Stable Ions
A
dissolve easily in water
12
Q
Covalent Bonds
A
share electrons
13
Q
Hydrogen Bonds
A
weak electrical forces cause an attraction (like magnets)
weak molecules are polar
14
Q
Hydrophilic
A
love water
polar
